The inevitable

I built a mud dam
after the rain
across a stream

And sat down
to watch
the water pool.

Over the rim
a trickle showed
and a slow
overflow began.

And then,
in one place
the mud dislodged

The water
poured through
again.

And the mud dam
once begun
to stop

a natural flow

Did cede
to the inevitable
and was soon gone.